Expanding the terms using the distributive property:

(2c)(8c) + (2c)(5) - (6)(8c) - (6)(5c) + (5c)(5c) - (5c)(-2) - (2)(5c) + (2)(2)

Simplifying each term:

16c^2 + 10c - 48c - 30c + 25c^2 + 10c + 10c + 4

Combining like terms:

16c^2 + 25c^2 + 10c - 48c - 30c + 25c^2 + 10c + 10c + 4
= 66c^2 - 68c + 4

Final result: 66c^2 - 68c + 4